**HEADER** | Treat the first line of the CSV file as a header. See [CSV format details](#csv-format-details).
_n_ **COLUMNS** | Format the source's data as a CSV with _n_ columns. See [CSV format details](#csv-format-details).
**DELIMITED BY** _char_ | Delimit the CSV by _char_. ASCII comma by default (`','`). This must be an ASCII character; other Unicode code points are not supported.
